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Consider a combined gas-steam power cycle. The topping cycle is a simple Brayton cycle that has...

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Mechanical Engineering

Consider a combined gas-steam power cycle. The topping cycle isa simple Brayton cycle that has a pressure ratio of 7. Air entersthe compressor at 15 ºC at a rate of 10 kg/s and the gas turbine at950 ºC. The bottoming cycle is a reheat Rankine cycle between thepressure limits of 6 MPa and 10 kPa. Steam is heated in a heatexchanger at a rate of 1.15 kg/s by the exhaust gases leaving thegas turbine, and the exhaust gases leave the same exchanger at 200ºC. Steam leaves the high-pressure turbine at 1 MPa and is reheatedto 400 ºC in the heat exchanger before it expands in thelow-pressure turbine. Assuming 80 percent isentropic efficiency forall pumps and turbines,

1)  determine the steam temperature at the inlet ofthe high-pressure. (hint: trial and error)

2) determine the net power output of the combined plant.

3)  determine the thermal efficiency of the combinedplant

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